I think that before more work went into Boombox, I remember the logo being explained as Optimus Prime wearing headphones... but it's OK that Boombox looks like Ops 'though, because so does G1 Camshaft:http://www.tfu.info/1985/Autobot/Camshaft/camshaft.htm
Now that I think about it, They could have repainted Camshaft into an Optronix of sorts.